Because the PHB1 is called "divine, arcane and martial heroes" we are guessing that PHB2 and following would be things like "psionic, steampunk and shadow heroes", power-source centered.
But what about the next PHB being about style of play ? Like "PHB3 : grim and gritty heroes" ? Or detailing level of play ? "PHB5 : epic heroes" (something like an expanded EPH). Or about morality "PHB7 : holy heroes" (something like 4e BoED, but player centric) ?
so, my question is : wich kind of books can be PHB, and wich kind of books won't be called core ?
But what about the next PHB being about style of play ? Like "PHB3 : grim and gritty heroes" ? Or detailing level of play ? "PHB5 : epic heroes" (something like an expanded EPH). Or about morality "PHB7 : holy heroes" (something like 4e BoED, but player centric) ?
so, my question is : wich kind of books can be PHB, and wich kind of books won't be called core ?